Abaixo está uma instrução que descreve uma tarefa de geração de SQL, combinada com uma entrada que fornece mais contexto sobre os esquemas de tabela disponíveis. Escreva o código SQL que responda adequadamente à solicitação
 ###Instrução: Quantos anos de jardim de infância são fornecidos em Ticino?
 ###Tabelas: CREATE TABLE provinces_of_afghanistan (provinces_of_afghanistan_id AUTO_INCREMENT PRIMARY KEY, Province VARCHAR, Map # INT, ISO 3166-2:AF VARCHAR, Centers VARCHAR, Population INT, Area (km²) INT, Language VARCHAR, Notes VARCHAR, U.N. Region VARCHAR) CREATE TABLE career_statistics (career_statistics_id AUTO_INCREMENT PRIMARY KEY, Year VARCHAR, Team VARCHAR, Games INT, Mins VARCHAR, FG% VARCHAR, 3P% VARCHAR, FT% VARCHAR, Rebounds VARCHAR, Assists VARCHAR, Steals VARCHAR, Blocks VARCHAR, Points VARCHAR) CREATE TABLE singles_finals:_18_11–7 (singles_finals:_18_11–7_id AUTO_INCREMENT PRIMARY KEY, Outcome VARCHAR, Date VARCHAR, Tournament VARCHAR, Surface VARCHAR, Opponent VARCHAR, Score VARCHAR) CREATE TABLE rebounds (rebounds_id AUTO_INCREMENT PRIMARY KEY, Rank INT, Player VARCHAR, Years VARCHAR, Games INT, Reb. Avg. INT, Total Rebounds INT) CREATE TABLE cantonal_school_systems (cantonal_school_systems_id AUTO_INCREMENT PRIMARY KEY, Canton VARCHAR, Years of Kindergarten INT, Years of Kindergarten provided VARCHAR, Years of Kindergarten legally required VARCHAR, Length of Primary School INT, Length of mandatory Secondary School INT, Separate Secondary Schools? VARCHAR, Cooperative Secondary Schools? VARCHAR, Integrated Secondary Schools? VARCHAR)  
SELECT Years of Kindergarten provided FROM cantonal_school_systems WHERE Canton = Ticino